Giant Ball Lightning

June 8, 1977, Fishguard, Dyfed, West Wales. A brilliant, yellow green, trans-parent ball, the size of a bus with a fuzzy outline, floated down a hillside. Slowly rotating, it seemed to bounce off projections on the ground. It flickered out after 3 seconds.

(Jones, Ian; "Giant Ball Lightning," Journal of Meteorology U.K., 2:271, 1977.)